Drilling appliance.



R. H. HARRIS.

DRILLING APPLIANCE. APPLICATION man MAYIZ'. 1917.

, 1,250,450. Patented De0.18,1917.

v 1%. Fla. /2.

marE finry ar/rub,

-of variQnsacross-sections to be drilled.

taken respectively innt sens-i muse, gaj smebe n20 si ma, 1 LIME,

rm-mm Paten'ted D'ec. 18;191" 7.

Application fi1edMay'12, 1.917.-

Serial No. 1685297.

Be -it lmowmthat I'-,'%RICHARDFI-IENRY3 HAR- ms, of Salisbury,,Southern Rhodesia; assubject oftheqKing' of England; and-at present residing 'z'tthLondon, -'En}gla nd, have invented fcertaini} new vand; useful Improvements in -DrillingtAppliances, of which the followlng 1s ,a' specification.v V. Thisvinventionehas for its: db ect-to prov-ide' improvedaappliancesfor enabling holes -According, to this invention; the drilling appliance comprises threeparts or members placed -='end -to end, one. end spa-rt being adaptedto be'received by the chuck and the -otheraend partsbeing adapted to reoei've or control the drill; the intermediate part being connected to the end partsby coupling connections which-allow-of relativelateral displacement of the three parts "or members. For this? purpose l may'employ groove and tongue connections. between the three parts. The 1 endparts or members are held against .br pressedon5 to the intermediate part by :elastiogor eresilient means, Thea-drill :may

*bei'guidedby a die or templetiuits lateral movement relatively to the materialwhlch is being drilled. p o I By theiuse. of 'th'ezappliance; holes of triangular, square or polygonal cross-section Jean be? readily and accurately drilled,

.RIn order, that the invention may be clearly ,;underst ood-. and readily; carried into; effect one embodiment of the invention will now be described with reference: to -the'=- aceom panying drawings, -inj.,Whi'ch:" Figures l a'nd 2areelevat1ons of -the drlllholding :vapp'liance, the 1 two views being two directions at right angles andFigr 2 beingfin section. I Fig. 3 is an under plan view of-the'appliance. H

4. is aztop plan View with certain parts-displaced as occurs in'the use of-the appliance. I 2 I .Figs,. 5 and ,6 are sections on the l1nes- 5'5 and 6+6 respectively in Fig. 2. v

Figs. 7, 8 and 9 are an elevationand end views respectively of a drillsuitab-le for use in drilling a hole of square cross-section. Eigs. 10 and llrare a plan and asideelevation respectively of thedie used in drilling a hole of squareacross-jsect on. 4

' Figs. 12 and 13 are an elevatlon and an View ofa drill suitable for use "drillmg a *hole of} hexagonal -cro ss-section, *and Fig. 14 is a'plan of'the' die us'ed-in drilling aa hole ofhexagbn'al cross section.

15 shows a tapered arrangementof one of the parts of the drillingappliance. The appliance comprises three cylindrical parts ,rB and C, ;whichare bored cen- V :trallyas shown. The part A'isin'sertedj in the; chuck -of: the *drilfling'iior" like "machine. Fined in the'bore ofthepart G is' astem C WlllCll passes upward through i the parts B and? ;A* screw-threaded at the top to receive a 'nut D. A spring Esurrounds'the top of the stem C its-ends-abutti ngj against "the-"nut .D and a washer. F resting onthe topwof'tthepart A. ITDhe shank of the drill is adapted to 'be inserted in the lower end of the boreC po'sition'by .a'set-screw C lThelpart Al -is provided? with two *t ongues 'or "projections *A" which fit intoand can laterally slide'dn corresponding grooves Fin the part- B; l he apart B- is also provided; with two tongues B w-hi'chvfit into and can laterall-y' 'slide *in corresponding grooves in the part C. The groovesin the part ;:'B a S which i receive ithe tongues :AQare on" akd'iameter at right ang-les to the diameter containing theatongues 1B.

. Gonsequentlythe part (1 can be displaced in sone direction relatively to theapart B and the part B can be displaced relatively to the part A- im a direction? at right' angles tofthe first; mentioned direction.- In: Fig.1 l the parts A, B and C are shownoutof ali ne- ;Inent. ;The; amount of relativeimovement of the-.p'artsA B and G -is limited bygthefclearance-betweenthe outside fof the I stenr- (Y and :the inner-walls of thepartseAiand B, y employing the appliance, the part- Ads fined in the. chuck of theqdrilling machine and the drill is fixed in the part C,-;ashere- 'inbefore; mentioned, A :die or templet ?inthe form ofathick hardenedplate, 'in which a hole has b'eenj cutof the same cross-section as that of theholetobe'drilled, is cl'amped to'the-Fmaterial; to-befi drilled. The drill whichrisof suitable shape-for, cutting the required, hole is :fed throughthe die and the holeis; drilledJ-in the ordinary manner. Though? the groovej' and tongue connections between the parts A, B and C; permit of the relativelateral'movement of these parts as hereinbeifiore described, these connections of the part Ciandf'ish'eldiin provide an efiective method of transmitting the rotary movement of the chuck to the drill and also of preventing the axis of the drill from being displaced angularly.

In Figs. 7 8 and 9, there is shown a drill and in Figs. 10 and 11 a die suitable for use in drilling a hole of square cross-section. The drill G has a shank G and three cutting edges G The outer ends of the three cut-' ting edges are at the vertices of an equilateral triangle and each side of the triangle is approximately equal in length to the side of the square hole to be drilled. The die H is provided with a square hole H.

For drilling a hole of hexagonal crosssection, a drill J having a shank J and five cutting edges as shown'Figs. 12 and 13 may be employed together with a die K as shown in Fig. 14. In drilling, a hole of any poly onal cross-section, a drill having a number of radical cutting edges at equal angles apart is preferably employed, the angle between two contiguous sides of the polygon formed by the outer ends of the edges being less than the angle between two contiguous sides of the polygonal hole to be drilled.

The part A may have a cylindrical outer surface as shown in Figs. 1 and 2 or its outer surface may be tapered or of any other suitable shape to fit the chuck. In Fig. 15 the part A is tapered. Instead of fitting the part A- directly into the chuck, the part A may be fixed into a sleeve or holder which is itself received by the chuck. Such arrangement of sleeve or holder will be easily understood by any one familiar with the art.

Instead of, or in addition to, employing an appliance as hereinbefore described for holding the drill, such an appliance may obviously be employed in connection with the supporting structure or holder for the material to be drilled.

Having thus described my invention what I claim as such and desire to secure by Let- I ters Patent is 1. A drilling appliance for enabling holes of various cross-sections to be drilled, comprising a plurality of members connected together and arranged in succession, said connected members adapted to be arranged between the chuck and drill, coupling connections between the three members, said coupling connections allowing lateral dis placement of the members relatively to one another, and resilient means for holding the end members up to the intermediate member.

2. A drilling appliance for enabling holes of various cross-sections to be drilled, comprising three members placed end to end,

one end member being adapted to be controlled by a rotating driver and the other end member being adapted to control the drill, the intermediate member being connected with the end members by devices which allow of laterally sliding movement, and elastic means for holding the end members up to the intermediate member.

3. A drilling appliance for enabling holes of various cross-sections to be drilled, comprisingthree members arranged end to end, one end member being adapted to be received by the chuck of the rotating device and the other end member being adapted to receive the drill, the intermediate member being connected to the end members by groove and tongue connections, and the end members being pressed on the intermediate member by resilient means. e

4. A drilling appliance for enabling holes of various cross-sections tobe drilled, comprising three members arranged end to end, one end member being engageable by the chuck of the driver and the other end memher being adapted to receive and control the drill shank, the intermediate member being connected to each of the'end members by grooves and tongues, the said groove and tongue connections between the intermediate member and one end member being at right angles to the groove and tongue connections between the intermediate member and the other end member, and resilient means for holding the end members pressed against the intermediate member.

5. A drilling appliance for enabling holes of various crossseotions to be drilled, comprising three hollow parts placed end to end, one said end part being receivable by the chuck and the opposite end part adapted to receive the drill, the intermediate part being connected to the end parts by sets of coupling connections which will allow of lateral displacement of the parts, the one set of coupling connections being at right angles to the other set, and a spring-fitted connection being the end parts passing through the intermediate part and serving to hold the outer parts against the intermediate part, in combination with a die having a hole of the cross-section to be drilled and through which the die passes.

' 6. The employment for drilling holes of various cross-sections, of a drilling appliance comprising three parts placed end to end, the intermediate part'being connected 5 cross-sections, the combination of a holder comprising three parts arranged end to end and having coupling connections which allow of lateral displacement between the said three parts, the end parts being held against the intermediate part in a resilient manner, of a drill adapted to be fitted to and controlled by one of said end members, and of a device shaped to the hole to be drilledand through which the drill is passed, for guiding the drill in its lateral movements.

8. As a means for drilling holes of various cross-sections, the use in combination of a holder comprising three parts placed end to end with the outer parts pressed against the median part and having coupling connections between said parts to allow of lateral displacement of said parts, of a drill, and of a guiding die shaped to the cross-section of 15 the hole to be bored, said drill being passed through said die.

In testimony whereof I aflix my signature in presence of two witnesses.

RICHARD HENRY HARRIS.

Witnesses:

MAURICE CLOUD, ERNALD S. MosELEY.

Cop es of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. G. i 

